# <span lang="EN-US

Given that

AB = AC and A = 70°

To find: B and C

AB = AC and also A = 70°

As two sides of triangle are equal, we say that ∆ABC is isosceles triangle.

Hence by the property of isosceles triangle, we know that base angles are also equal.

ie. we state that B = C. …(1)

Now,

Sum of all angles in any triangle = 180°

A + B + C = 180°

Hence,

70° + B + C = 180°

2 B = 180° - 70° …from (1)

2B= 110°

B = 55°

Therefore, our base angles, B and C, are 55° each.

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